We were talking in class just recently about the overwhelming odds that Christians faced in the early (first century) church.
Peter Wagner suggests that in the best of estimates Christians were outnumbered, after they had grown significantly, by a 1 to 30,000 ratio! And yet...
To the church at Rome Paul could write within thirty years of Pentecost: “First, I thank my God through Jesus Christ for you all, that your faith is proclaimed throughout the whole world” (Rom. 1:8)
And again, in the Colossians letter from prison: “The gospel…is come unto you; even as it is also in all the world bearing fruit and increasing, as it doth in you also, since the day ye heard and knew the grace of God in truth” (Col. 1:5b, 6)
Justin Martyr (100?-165?) “There is not a single race of human beings, barbarians, Greeks, or whatever name you please to call them, nomands or vagrants or herdsmen living in tents, where prayers in the name of Jesus the crucified are not offered up. Through all the members of the body is the soul spread; so are Christians throughout the cities of the world.”
Tertullian (160-230) We are but of yesterday. Yet we have filled all the places you frequent – cities, lodging houses, villages, townships, markets, the camp itself, the tribes, town councils, the palace, the senate, and the forum. All we have left you is your temples….Behold, every corner of the universe has experienced the gospel, ad the whole ends and bounds of the world are occupied with the gospel.
Lactantius (contemporary of Paul): “Nero noticed that not only at Rome but everywhere a large multitude were daily falling away from idolatry and coming over to the new religion.” (above take from Harnack, The Mission and Expansion of Christianity in the First Three Centuries)
I am reminded, contemplating such data, of C.S. Lewis' thought on the power of the pure in heart.
"How little people know who think that holiness is dull. When one meets the real thing...it is irresistible. If even ten percent of the world's population had it, would not the whole world be converted and happy before a year's end?" (Letters to an American Lady)